I'm sure this question has been asked in the past, but I am wanting to know what kind of fuel consumption to expect on a '87 Sea Ray 390. It has dual 454's with 1200 hrs on them. I have seen some posts for Brand X that had MPG per RPM. I am new to power boating, this being my first powerboat, but have been sailing for the last 27 years. I've been green long enough. Any information you can provide is appreciated.

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